Chemistry and Physics. 311 
rosolic acid as identical— Ber. Berl. Chem. Ges., x, sie June, 
1877. P 
6. On Hematin.—CazEnEvve has prepared beinaiin nde 
ined its properties. For its areionaee defibrinated ides: ose 
treated with twice its volume of commercial ether, allowed to 
stand twenty-four hours, ie ether Heneneene from the clot, and 
this clot exhausted by the ether containing now two per cent of 
oxalic acid. The etherial solution, colored a sone ehiee by the 
hematin, was exactly saturate by ethe ae with ammonia 
gas, and the precipitated hematin was collected, washed with 
water, alcohol and ether and then ae e product is pure 
ematin. In presence of alcohol and ether, it combines readily 
with Freire. Wise eect and hydri riodic nie, giving crys- 
tallized compounds. On analysis, it afforded 6 18 per cent of 
es dichroic; and the hematin ae into two sutaiaeres (A) 
an e first is obtained ure by the dialysis of the solu- 
tion till it is no Ongar acid. It exists as suspended flocks, the 
gives a one-banded spectrum, in alkalies, a four-ban 
Bull. Soc, Ch., UW, xxvii, 485, June, 1877 F. B. 
Shee On the Nature of what is commonly termed a“ Va acuum ;” 
is commonly termed a ‘ Vacuum,’ ” might perhaps suppose with 
him that the subject is one which had not been previously noticed, 
and conclude that we are as yet without an explanation of 
“‘ Crookes’s force,” in which the vast multitude a he gaseous 
molecules that are present has been taken into acco 
e subject is one which cannot, I should think, _ been over- 
looked by any real student of the ‘molecular theory 0 of gases; and 
in particular your readers ie a it ‘oe sree . a paper that 
I presented ten years ago t al we 5 pede hil. Mag. 
[1V], vol. xxxvi, p. 141):—“ It is peo ee le that there are 
